Mahrous, Aliaa IbrahimSalama, Aya AShabaan, Alshaimaa AhmedAbdou, AhmedRadwan, Mohamed Mostafa2023-09-192023-09-192023-08https://doi.org/10.1186/s12903-023-03364-6http://repository.msa.edu.eg/xmlui/handle/123456789/5717Background One of the most common causes of aesthetic failure and restoration replacement is the tooth restorations color mismatch specifcally after aging. Methods One hundred and two participants with endodontically treated frst molar were selected clinically. The patients were randomly splited into two groups and restored either with Cerasmart hybrid ceramic or Vita Enamic polymer infltrated ceramic network (PICN) crowns and cemented using dual cure adhesive cement. The color difer- ence (ΔE) values after cementation at 0 (Baseline), 6, and 12 months of use were obtained by quantifcation of L*, a*, and b* values with a digital spectrophotometer. Mann–Whitney test used to compare between tested groups at each time point and between (α=0.05). Results At 6 months follow-up intervals, Vita Enamic group showed the highest signifcant ∆L* (p=0.035) and ∆a* (p<0.001) compared to Cerasmart group. ∆b* and ∆E showed no signifcant diference between both groups (p>0.05). Furthermore, all color parameters of both groups showed statistically signifcant diference at 12 months follow-up intervals. After 12 months, Vita Enamic restorations presented higher color change compared to Cerasmart restorations with a (p-value of 0.0120). When comparing the total color diference ∆Et through-out the follow-up intervals of Vita Enamic & Cerasmart groups, there were insignifcant diference (p=0.263). Conclusion Both hybrid materials demonstrated comparable color stability after 1 year of clinical service within clini- cal acceptance range. However, Cerasmart demonstrated a better colour stability after 1 year. Trial registration ClinicalTrials.gov (ID: NCT05501808) 15/8/ 2022- ‘retrospectively registered’.enDental restoration, Ceramics, Resin matrix, Color stability, SpectrophotometerArticlehttps://doi.org/10.1186/s12903-023-03364-6